Idle Adjustment after new ISV - Where to start? [86 944]
01-06-2010, 10:39 AM
#31
Instructor
Thread Starter
-6F or C? If it's -6C, then it's been colder here. My water heater just started leaking too. Good thing I rent, and my landlords swapped it out for nothing. But I know how much of a pain it is to not have hot water.
Good luck!
Good luck!
01-06-2010, 11:31 AM
#32
Burning Brakes
02-06-2017, 04:14 PM
#33
Rennlist Member
Resurrecting an old thread that was a big help to me in diagnosing a lack of idle kick-up when cold or when turning on the AC. The ISV vibrated at idle but it just wasn't doing anything. So I yanked the manifold, removed the ISV and tested on the bench.
It was plenty gummy, hard to rotate the barrel valve, and would only power in one direction. (closed) Replaced it with a good used one off eBay, and decided to open up the old one to see what's inside.
Easy to see why it failed. There are three poles on the motor, and three tungsten contacts leading from the pins to the commutator. Because the motor moves back and forth a lot, one of the tungsten contacts nearly wore a hole in the commutator segment for the Open pole. In fact the tungsten was gone. The commutator is made of a very soft metal, not sure what it is, but it's nowhere near as hard as copper.
It was plenty gummy, hard to rotate the barrel valve, and would only power in one direction. (closed) Replaced it with a good used one off eBay, and decided to open up the old one to see what's inside.
Easy to see why it failed. There are three poles on the motor, and three tungsten contacts leading from the pins to the commutator. Because the motor moves back and forth a lot, one of the tungsten contacts nearly wore a hole in the commutator segment for the Open pole. In fact the tungsten was gone. The commutator is made of a very soft metal, not sure what it is, but it's nowhere near as hard as copper.
